NB: .First.lib is obsolete and will not be used in R >= 3.0.0
File ‘yacca/R/zzz.R’:
  .First.lib calls:
    cat(paste("'", ehelp[4], "'\n", "Version ", ehelp[2], " created on ",     ehelp[3], ".\n", sep = ""))
    cat(paste(substring(ehelp[3], first = 16), "\n", "Version ",     substring(ehelp[4], first = 16), " created on ", substring(ehelp[5],         first = 16), ".\n", sep = ""))
    cat("Copyright (c) 2008, Carter T. Butts, University of California-Irvine\n")
    cat("For citation information, type citation(\"yacca\").\n")
    cat("Type help(\"yacca-package\") to get started.\n")

Package startup functions should use ‘packageStartupMessage’ to
  generate messages.
See section ‘Good practice’ in '?.onAttach'.

F.test.cca: no visible global function definition for ‘pf’
cca: no visible global function definition for ‘cov’
cca: no visible binding for global variable ‘sd’
cca: no visible global function definition for ‘cor’
helio.plot: no visible global function definition for ‘plot.new’
helio.plot: no visible global function definition for ‘plot.window’
helio.plot: no visible global function definition for ‘lines’
helio.plot: no visible global function definition for ‘text’
helio.plot: no visible global function definition for ‘polygon’
helio.plot: no visible global function definition for ‘title’
plot.cca: no visible global function definition for ‘par’
plot.cca: no visible global function definition for ‘plot’
plot.cca: no visible global function definition for ‘abline’
plot.cca: no visible global function definition for ‘text’
plot.cca: no visible global function definition for ‘barplot’
plot.cca: no visible global function definition for ‘rainbow’
print.F.test.cca: no visible global function definition for
  ‘printCoefmat’
print.summary.cca: no visible global function definition for ‘pchisq’
print.summary.cca: no visible global function definition for
  ‘printCoefmat’
Undefined global functions or variables:
  abline barplot cor cov lines par pchisq pf plot plot.new plot.window
  polygon printCoefmat rainbow sd text title
Consider adding
  importFrom("grDevices", "rainbow")
  importFrom("graphics", "abline", "barplot", "lines", "par", "plot",
             "plot.new", "plot.window", "polygon", "text", "title")
  importFrom("stats", "cor", "cov", "pchisq", "pf", "printCoefmat", "sd")
to your NAMESPACE file.